Add unit test.

Signed-off-by: Random-Liu <lantaol@google.com>

pkg/server/helpers_test.go

@@ -0,0 +1,59 @@
+/*
+Copyright 2017 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package server
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/kubernetes-incubator/cri-containerd/pkg/metadata"
+)
+
+func TestGetSandbox(t *testing.T) {
+	c := newTestCRIContainerdService()
+	testID := "abcdefg"
+	testSandbox := metadata.SandboxMetadata{
+		ID:   testID,
+		Name: "test-name",
+	}
+	assert.NoError(t, c.sandboxStore.Create(testSandbox))
+	assert.NoError(t, c.sandboxIDIndex.Add(testID))
+
+	for desc, test := range map[string]struct {
+		id       string
+		expected *metadata.SandboxMetadata
+	}{
+		"full id": {
+			id:       testID,
+			expected: &testSandbox,
+		},
+		"partial id": {
+			id:       testID[:3],
+			expected: &testSandbox,
+		},
+		"non-exist id": {
+			id:       "gfedcba",
+			expected: nil,
+		},
+	} {
+		t.Logf("TestCase %q", desc)
+		sb, err := c.getSandbox(test.id)
+		assert.NoError(t, err)
+		assert.Equal(t, test.expected, sb)
+	}
+}